This is my DO build this league:
https://pastebin.com/nC5P4qmB

Estimated budget: 10 ex (probably less now)

Damage : 500k aura farming DPS (a fairly conservative estimate) and there is also level 26 Vaal Blight (20 from gem, +5 from level 3 empower and +1 from level 2 awakened void manipulation) for more damage. Bossing beyond regular red map bosses is still uncomfortable , but those it handles quite well.

Defenses : the build runs 5 defensive auras (including 2 curses) and 3-slot Molten Shell. ~27k armor without flask, 38k armor with flask (7.2 sec armor flask, triggered manually). ~5k life at lvl 92 , ~1.9 es (with "corrupted soul" and 5% life from Vaal passives). "Elusive" buff from Withering Step also adds a defensive layer.

Recovery: on kill we recover 6% life , 35 life, 2% energy shield and 15 energy shield.

Other: There is a 12 % chance to generate a charge on kill and Sinvicta's Mettle in the 2nd slot is a source of Rampage.